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Svelte's radical idea: what if the framework disappeared? A .svelte file looks like HTML with superpowers — reactive variables, conditional rendering, transitions — but the Svelte compiler transforms it into vanilla JavaScript that manipulates the DOM directly. No virtual DOM, no framework runtime, no diffing algorithm. The result is smaller bundles and faster performance.
A .svelte file combines markup, script, and styles in a single file (similar to Vue), but the syntax is closer to plain HTML. Reactive state is a regular variable assignment: `let count = 0;` and the compiler generates the update logic. This simplicity is Svelte's signature — code that looks like it shouldn't work, but does, because the compiler handles everything.
SvelteKit (Svelte's full-stack framework) has grown Svelte's adoption significantly. VS Code with the Svelte extension provides full language support. The learning curve is genuinely short — if you know HTML, CSS, and basic JavaScript, you can read and write Svelte components within an hour.